Gravel-screening machine



Patented Feb. 2, 1892.

P. T. GILBERT. GRAVEL SCREENING MACHINE.

(No Model.) m

l/VVENTUH Iran/U61 1' 62760 6 By M ATTORNEYS UNITED STATES PATENTOFFICE.

FRANKLIN 'l. GILBERT, OF WALLA ALLA, ASSIGNOR TO SUSIE M. RUSSELL, OFSEATTLE, YVASIIINGTON.

GRAVEL-SCREENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 468,197, dated February2, 1892.

Application filed September 25,1891. Serial No. 406,875. (No model.)

To LLZZ whom it may concern.- ing at a point in advance of the rear endof Be it known that I, FRANKLIN T. GILBERT, the side walls Z2 whereby adischarge-oped residing at Walla Valla, in the county of ing b isprovided for a purpose presently exlValla \Valla and State of\Vashington, have plained, wedge-like converging blocks 12 be- 5invented certain new and useful Improveing secured upon the inner facesof the ends ments in Gravel-Screening Machines, of which of the walls 6which serve as directors for the following is a specification. theflowing Water to concentrate its precipi- My invention has for itsobject to provide tation into the next underlying trough to agravel-washer in which a continuous treatthereby prevent any of thewater flowing I0 ment of the gravel is obtained, whereby a outside.

number of separations of the coarser from the By reference to Fig. 2 itwill be seen that finer grades of gravel will take place; and it themixed water and gravel after it enters the consists in the peculiarcombination and hopper C from the flume D enters a trough B novelarrangement of parts, all of which will constructed similar to thetroughs B B B I 5 hereinafter be fully described in the annexed whichlead the water and gravel to discharge specification, and particularlypointed out in against a separator-screen D, hinged at its the claims,reference being had to the accomlower end to the closed end of thetrough B, panying drawings, in which the upper end of such screenprojecting above Figure 1 is a perspective view of my imthe dischargeend of the trough B By pro- 20 proved gravel screener or separator. Fig.2 viding the opening 11 in the bottom of the is a longitudinal sectionof the same. Fig. 3 troughs anopportunity is given for such gravel is adetail perspective view of one of the or sand as will not pass throughthe screen screens and its attached trough or chute, and to drop intothe bin a below it. Fig. 4 is a detail perspective view of the cam- Itshould be stated that the screen D is of 2 5 disk hereinafter referredto. a coarse mesh and allows of the passage In the practicalconstruction of my gravelthrough it of the intermediate sizes of gravel,screening apparatus 1 provide a support or which, with the water, arethen carried into frame A, which is divided into a series of bins thenext trough B, from whence they are disa a (1 which are arranged toreceive the difcharged against a screen D, which separates 8o 30 ferentgrades of gravel in the manner prestheintermediate-sized particles fromthe finer ently described, each of such bins being progravel anddischarges it into the bin at. The vided with a discharge-opening andcut-01f finer particlesandwaterthen enterthe trough slide a whereby thecontents of each bin B from which they are discharged against a may bereadily discharged into a car. as shown third but very fine screen Dwhich separates 8 5 35 in Fig. l of the drawings. It will also be nothefiner gravel and sand particles from the ticed by reference to thedrawings that the water, which particles fall into the bin a tops of theseveral bins are stepped, and such The water then passes into a troughor chute bins are of different sizes, the rear one a be- E, Whichdischarges it onto a water-wheel F, ing arranged to receive the coarsergravel, the a deflector-plate Gbeing provided to cause the 4o center onea the intermediate size of gravel, water to fall onto the wheel F in aneffective and the front one a the finer particles of manner. gravel, thepurpose of stepping the upper By arranging the screening devices asdeportions of the bins being to accommodate scribed the separated gravelwill drop into the several screening devices, the constructhe binsthrough the openings b and to pre- 9 5 45 tion and arrangement of whichforms the esvent clogging at these points I hinge the sential part ofthis invention. screens, as showmand connect the upper ends 13 B Bindicate the screeningtroughs, one thereof with a shaker-bar 11, held tobe 1011- of which is shown in detail in Fig. 3, each of gitudinallyreciprocated in guides h h on the which consists of a rectangular frame,havframe. The lower end of the bar His con :00 5o ing a closed bottomI), a closed forward end nected with the long arm of a rocking lever I,b, and an open rear end the bottom Z1 endpivoted to the main frame atz', the short arm of which leverhas amember which engages a cam-disk Jon the shaft f of the wheel F. By this construction it will be observedthat as the wheel F is operated by the waste water reciprocating motionis imparted to the bar H. and the screens D D D constantly agitated, andto provide for sudden jars to such screens I employ a spiral spring K,which serves to quickly retract the bar H after ithas been drawn out andthe memberi passes the vertical sections of the cam-grooves. V

lNhile I prefer to employ the waste water as a motive power foragitating the screws, I do not desire to limit myself thereto, as othermeans might be readily employed for reciprocating the bar H.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

1. A gravel-screening machine comprising a main frame formed with aseries of bins, a series ofreceiving-troughs mounted over such bins andarranged step by step, each trough having a closed receiving and an opendischarge end, the discharge end of one trough being disposed over thereceiving end of the next succeeding one, and a series of screens ofdiiferent mesh interposed between the meetingends of the several troughsand arranged substantially as shown and described, whereby tosuccessively separate the larger particles of gravel from the water andto deflect them to discharge into their respective receiving-bins, asand for the purpose stated.

2. The combination, with the main frame formed with a series of bins a aa of the troughs B B B 13 having open discharge ends, the screens D D Dheld to vibrate in front of such discharge ends and to separate thedifferent grades of gravel, the waterwheel, and devices intermediate ofsaid wheel and the screens whereby the screens are vibrated as the wheeloperates, substantially B the screens D D D hinged at the forward endsthereof, as shown, and the water-wheel F, of the reciprocating rod H,connected with the screens D D D the pivoted lover I, and the cam J,operated by the water-wheel, all arranged as and for the purposedescribed.

5. In a gravel-screening machine,a screening and separating deviceconsisting of two or more troughs having an open end an d a screen onone of said troughs extending over the open end of the other trough andarranged to receive the material therefrom, said troughs havingconverging ends formed with an Opening b in their base, all arranged asand for the purpose described. I

FRANKLIN T. GILBERT.

Vitnesses:

M. W. LovEJoY, Z. 13. RAWsON.

